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<h1 id="doodson">Doodson</h1><p>
This is a string which describes a tidal frequency either coded as Doodson number
or using Darwin´s name, e.g. <code>255.555</code> or <code>M2</code>.</p><p>The following names are defined:
<ul>

<li><code>055.565</code>: <code>om1</code>  </li><li>
<code>055.575</code>: <code>om2</code>     </li><li>
<code>056.554</code>: <code>sa</code>
</li><li>
<code>056.555</code>: <code>sa</code>   </li><li>
<code>057.555</code>: <code>ssa</code>     </li><li>
<code>058.554</code>: <code>sta</code>
</li><li>
<code>063.655</code>: <code>msm</code>  </li><li>
<code>065.455</code>: <code>mm</code>      </li><li>
<code>073.555</code>: <code>msf</code>
</li><li>
<code>075.555</code>: <code>mf</code>   </li><li>
<code>083.655</code>: <code>mstm</code>    </li><li>
<code>085.455</code>: <code>mtm</code>
</li><li>
<code>093.555</code>: <code>msq</code>  </li><li>
<code>093.555</code>: <code>msqm</code>    </li><li>
<code>125.755</code>: <code>2q1</code>
</li><li>
<code>127.555</code>: <code>sig1</code> </li><li>
<code>127.555</code>: <code>sigma1</code>  </li><li>
<code>135.655</code>: <code>q1</code>
</li><li>
<code>137.455</code>: <code>ro1</code>  </li><li>
<code>137.455</code>: <code>rho1</code>    </li><li>
<code>145.555</code>: <code>o1</code>
</li><li>
<code>147.555</code>: <code>tau1</code> </li><li>
<code>155.655</code>: <code>m1</code>      </li><li>
<code>157.455</code>: <code>chi1</code>
</li><li>
<code>162.556</code>: <code>pi1</code>  </li><li>
<code>163.555</code>: <code>p1</code>      </li><li>
<code>164.555</code>: <code>s1</code>
</li><li>
<code>165.555</code>: <code>k1</code>   </li><li>
<code>166.554</code>: <code>psi1</code>    </li><li>
<code>167.555</code>: <code>fi1</code>
</li><li>
<code>167.555</code>: <code>phi1</code> </li><li>
<code>173.655</code>: <code>the1</code>    </li><li>
<code>173.655</code>: <code>theta1</code>
</li><li>
<code>175.455</code>: <code>j1</code>   </li><li>
<code>183.555</code>: <code>so1</code>     </li><li>
<code>185.555</code>: <code>oo1</code>
</li><li>
<code>195.455</code>: <code>v1</code>   </li><li>
<code>225.855</code>: <code>3n2</code>     </li><li>
<code>227.655</code>: <code>eps2</code>
</li><li>
<code>235.755</code>: <code>2n2</code>  </li><li>
<code>237.555</code>: <code>mu2</code>     </li><li>
<code>237.555</code>: <code>mi2</code>
</li><li>
<code>245.655</code>: <code>n2</code>   </li><li>
<code>247.455</code>: <code>nu2</code>     </li><li>
<code>247.455</code>: <code>ni2</code>
</li><li>
<code>253.755</code>: <code>gam2</code> </li><li>
<code>254.556</code>: <code>alf2</code>    </li><li>
<code>255.555</code>: <code>m2</code>
</li><li>
<code>256.554</code>: <code>bet2</code> </li><li>
<code>257.555</code>: <code>dlt2</code>    </li><li>
<code>263.655</code>: <code>la2</code>
</li><li>
<code>263.655</code>: <code>lmb2</code> </li><li>
<code>263.655</code>: <code>lambda2</code> </li><li>
<code>265.455</code>: <code>l2</code>
</li><li>
<code>271.557</code>: <code>2t2</code>  </li><li>
<code>272.556</code>: <code>t2</code>      </li><li>
<code>273.555</code>: <code>s2</code>
</li><li>
<code>274.554</code>: <code>r2</code>   </li><li>
<code>275.555</code>: <code>k2</code>      </li><li>
<code>283.655</code>: <code>ksi2</code>
</li><li>
<code>285.455</code>: <code>eta2</code> </li><li>
<code>355.555</code>: <code>m3</code>      </li><li>
<code>381.555</code>: <code>t3</code>
</li><li>
<code>382.555</code>: <code>s3</code>   </li><li>
<code>383.555</code>: <code>r3</code>      </li><li>
<code>435.755</code>: <code>n4</code>
</li><li>
<code>445.655</code>: <code>mn4</code>  </li><li>
<code>455.555</code>: <code>m4</code>      </li><li>
<code>473.555</code>: <code>ms4</code>
</li><li>
<code>491.555</code>: <code>s4</code>   </li><li>
<code>655.555</code>: <code>m6</code>      </li><li>
<code>855.555</code>: <code>m8</code>
</li></ul>

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